Circular glass-cutter.



A. F. JOHNSTON.

CIRCULAR GLASS CUTTER. APPLICATION FILED SEPT. 22. 1915.

"Milk;

11 1 1 I mwwmmmwmfwwww I1 all;

INVEN'TUR' STTES ALBERT F. JOHNSTON, OF TOLEDO, OHIO, ASSIGNOR OFONE-THIRD TO LEO RIES AND ONE-THIRD T0 ALBERT N. RIES, OF TOLEDO, OHIO.

CIRCULAR GLASS-CUTTER.

To all whom it may concern:

Be it known that I, ALBERT F. JOHNSTON, a citizen of the United States,and a resident of Toledo, in the county of Lucas and State of Ohio, haveinvented a certain new and useful Circular Glass-Cutter; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the characters of reference markedthereon, which form a part of this specification.

This invention relates to a glass cutting apparatus of the circularcutting type, and has for its object the provision of a simple andimproved apparatus of this class which is highly efficient in itsoperation and easily and quickly adjustable to receive cutters ofdifferent diameters to suit the size 'of the disks desired to be out.

A further object of my invention is the provision in a machine of theclass described, of means which is operable to hold the work internallyof the cutter to prevent a relative turning of the glass disks when outand the consequent scratching of the faces thereof by reason of thefrictional driving coaction of the rapidly rotating cutter with theedges of the several disks.

A further object of my invention is the provision of means for bankingemery or other abrasive material against the sides of the cutter at thetop of the work to facilitate the cutting operation. Further objects andadvantages of the invention will be ap parent from the followingdetailed description thereof.

While the invention in its broader aspect is capable of embodiment innumerous forms, a preferred embodiment only thereof is illustrated inthe accompanying drawings, in which,-

Figure 1 is a side elevation of a portion of a machine embodying theinvention, with the operative parts and the work being acted on invertical section. Fig. 2 is a top plan view of the cutter carrying headwith cutter blade attached. Fig. 3 is a perspective view of a cutterblade bent into circular form as it appears in use, and Fig. 4 is aerspective view of one of the adjustable blade holding blocks.

Referring to the drawings, 1 designates a Specification of LettersPatent.

ing my invention, said frame portion having,

in the present instance, a pair of horizontally projecting verticallyspaced arms 2, 2, which are provided in their outer ends with axiallyregistering bearings 3, 3. A hollow shaft 4 is provided in verticalposition within the bearings 3, 3 for rotary and axial movements thereinand carries a belt pulley 5 from which a belt may run to any suitablesource of power. The lower end of the shaft 4 carries a cutter bladeholding head, which, in the present instance, comprises a body part 6that is removably screwed onto the shaft end and from which radiallyprojects a plurality of arms 7, which, in the present instance, are sixin number. A blade carrying block 8 is mounted on each arm 7 forlongitudinal sliding movements thereon and is secured in adjustedrelation thereto,

Patented Mar. 20, 1917.

Application filed September 22, 1915. Serial No. 51,995.

cesses 10 for receiving the curved upper edge of a cutter blade 11.

The cutter blade 11 comprises a strip of sheet metal bent into circularform, the

length of the strip being such that when the ends thereof are broughtinto abutting relation the cutter will be of predetermined size, stripsof different lengths being provided for cutting disks of differentsizes. The v upper edge of the cutter blade is loosely inserted into thecircularly registering recesses 1.0 of the set of holding blocks 8,being held therein by frictional action due to the outward springingtendency of the blade against the outer walls of the recesses. It ispreferable, however, screw 12 in one block 8, which screw extendstransversely through the recess of the block and a registering hole 13in one end of the cutter blade strip. It is preferable to provide thelower or cutting edge of the blade with a plurality of notches 14;, therear walls of which, with respect to the direction of turning of theblade, are inclined or curved, as at 15, to permit emery or otherabrasive material, which is used in connection with the cuttingoperation, to work under the lower cutting edge of the cutter blade.

Projecting axially through the shaft 4, which is made hollow for suchpurpose, is a stem 16, the upper end of which projects to provide aholding work holder 18, preferably of circular or the size of thecutting blade. In operation the holder 18 bears downward on the work.

I through which the blade 11 works.

disk form, and of a size which is less than the internal diameter of thecutting blade which is used. The work holder 18 is preferably removablyattached to the lower end of the stem 16, by thread or otherwise, to

adapt holders of different sizes to be attached to the stem as may bedesired to suit 19 interiorly of the blade 11 and serves to prevent therelative turning of the disks severed from the glass sheets that wouldtake place, due to the frictional driving'coaction of the cutter bladewith the disks, as the cut ting progresses, and also prevents theconsequent scratching or marring of the disk faces due to the relativeturningof one on another. The work may comprise a single sheet of glassor several sheets placed one on top of another.

20 designatesa banking ring, which is placed on the work 19andcooperates with the periphery. of the work holder 18 when resting on thework, to form a trough The adj acent faces of the ring and work holderare oppositedly inclined tonarrow the troughfrom the top to the bottomthereof, whereby emery or other abrasive material placed therein feedstoward the cutting blade.

It is found in practice that the best results are obtained by making thecutting blades 11 from galvanized sheet metal as a more rapid cutting iseffected by the use of such material than with steel or other materialswhich have been used.

It is evident in the operation of my circular cutting apparatusthatcutting blades of different diameters may be used to suit the sizeof the disks which it is desired to obtain; that the blade holders 8 areadjustable lengthwise of the arms 7, as the size of the blade employedmay require; that the cutter feeds downward by gravity through the workin the cutting operation and that the work holder .18 bears downwardwith predetermined force against the work internally of the cuttingblade to hold the same in rigid relation until. the cutting iscompleted.

blade of circular form carried at its upper edge by said blocks inconcentric relation to the axis of rotation of the head.

2. In an apparatus of the class described, a rotatable head havingradially adjustable blade carrying members, and a strip of sheet metalbent into circular form to form a circularv cutter and being carried andretained by said members in the circular form in which bent. 3. In anapparatus of the class described, a rotary head having a plurality ofradially adjustable blade carrying members, a strip of sheet metal bentinto circular form to form a circular cutting blade and carried by saidmembers in pendant relation with its ends substantially in abutment, andmeans carried by one of said members and engaging the blade to retain itto the members.

4. In an apparatusof'the class described, a circular rotary blade, and awork-holding part disposed interiorly of the blade and formin a meansfor banking an abrasive materia against the blade. 4 5. In an apparatusof the class described,

aframe having a vertical bearing, a hollow cally through said shaft forfree vertical and rotary movements relative thereto, and weighted meansbearing on the upper end of said stem for exerting a downward thrustthereon.

In testimony whereof, I have hereunto signed my name to thisspecification.

ALBERT F. JOHNSTON.

